Signal input/output device



FIG. 1 is a top, front and left side perspective view of a signalinput/output device showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a bottom plan view thereof;

FIG. 6 is a right side view thereof; and,

FIG. 7 is a left side view thereof.

The ornamental design for a signal input/output device, as shown.